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A ferrocene-modified platinum electrode as a potentiometric sensor for l-ascorbic acid

✍ Scribed by Marianne Petersson

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
349 KB
Volume
147
Category
Article
ISSN
0003-2670

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✦ Synopsis

A half-oxidized platinum electrode modified with a monolayer of ferrocene is proposed as a potentiometric sensor for L-ascorbic acid in an aqueous glycine buffer pH 2.2. The ferrocene was covalently attached to the surface by a silane carbon chain. The potentials of 15 electrodes were measured and aslope of (50 + 8.8) mV per decade change m concentration of ascorbic acid was obtained over the concentration range 10-3-10"

M. Recovery experiments with pure L-ascorbic acid solutions showed a relative standard deviation of 1.9%, in the analysis of fresh orange juice, the relative standard deviation was 6.1%.

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